Yes, the 2DS has the same firmware as the 3DS. Dont format the system when you are under Firmware ~5 though, as it will ask you to move the 3D regulator, which doesnt exist on the 2ds.

Edit: Also, the easiest and best guide is the Plailect Guide( github.com/Plailect/Guide/wiki ).
Follow every step to the letter, and dont use video guides. But wait a few days, the guide is gonna get a HUGE update, which will make the process easier, safer, and faster.